This is the 9053rd most frequent Swedish word.
efterfest
"Efterfest" means "afterparty" in English.
The word 'efterfest' here clearly indicates a party held after another major event, such as a concert.
Vi planerar en stor efterfest efter konserten.
We are planning a big after-party after the concert.
'Efterfest' is used as a noun to describe the actual event that took place after the main one.
Efterfesten blev riktigt lyckad med mycket dans och musik.
The after-party turned out really successful with lots of dancing and music.
The term 'efterfest' in this sentence specifies an upcoming planned event occurring after another one, for which preparations are being made.